WordNet sense 1 (the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second):

speed of light, light speed

WordNet sense 2 (one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)):

deoxycytidine monophosphate

WordNet sense 3 (a base found in DNA and RNA and derived from pyrimidine; pairs with guanine):

cytosine

WordNet sense 4 (an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds):

carbon

WordNet sense 5 (ten 10s):

century, hundred, centred, one C

WordNet sense 6 (a degree on the centigrade scale of temperature):

degree centigrade, degree Celsius

WordNet sense 7 (a unit of electrical charge equal to the amount of charge transferred by a current of 1 ampere in 1 second):

coulomb, ampere-second

WordNet sense 8 (the 3rd letter of the Roman alphabet):

letter c

WordNet sense 9 (street names for cocaine):

blow, coke, snow, nose candy

WordNet sense 10 (being ten more than ninety):

one hundred

WordNet sense 11 (being or denoting a numerical quantity but not order):

cardinal